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TS52002 Datenblatt(PDF) 7 Page - List of Unclassifed Manufacturers

Teilenummer TS52002
Bauteilbeschribung  High Efficiency NiMH Battery Charger for Photovoltaic Sources
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TS52002
Version 1.2
Specifications subject to change
WWW.TRIUNESYSTEMS.COM
Copyright © 2011, Triune Systems, LLC
FUNCTIONAL DESCRIPTION
The TS52002 is a fully-integrated MPP regulator IC based on a highly-efficient switching topology. It includes a Maximum
Power Point Tracking (MPPT) function to optimize its input voltage to extract the maximum possible power from a
photovoltaic cell. A 1 MHz internal switching frequency facilitates low-cost LC filter combinations.
When the output voltage is below the termination voltage, the device will regulate to the maximum power point. This will
continue as long as the output current is below the current limit and no fault has occurred. In order for the Maximum Power
Point (MPP) regulation to be most effective, the output load needs to not allow high frequency transients in output voltage.
This will cause the device to operate at a non optimal MPP point until the output voltage has remained static for several
milliseconds.
As detailed in the Application Diagram, the external µC pulses the charging current based on a NiMH charging profile. The
battery voltage and/or temperature is monitored to safely charge and ensure the battery is fully charged. One or two NiMH
cells can be configured in series or parallel with a parallel configuration requiring two switches to allow the µC to manage the
charging profile.
INTERNAL PROTECTION DETAILS
Internal Current Limit
The current through the inductor is sensed on a cycle by cycle basis and if current limit is reached, it will abbreviate the cycle.
Current limit is always active when the regulator is enabled.
Thermal Shutdown
If the temperature of the die exceeds 170C (typical), the SW outputs will tri-state to protect the device from damage. The nFLT
and all other protection circuitry will stay active to inform the system of the failure mode. Once the device cools to 160C
(typical), the device will attempt to start up again. If the device reaches 170C, the shutdown/restart sequence will repeat.
VIN Under-Voltage Lockout
The device is held in the off state until VIN reaches 3.15V. There is a 200mV hysteresis on this input, which requires the input
to fall below 2.95V before the device will disable.
VBAT Over-Voltage Protection
The TS52002 has an output protection circuit designed to shutdown the charging profile if the output voltage is greater than
the termination voltage. Shutting down the charging profile puts the TS52002 in a fault condition.


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